Incidence Rate & Rate Ratio (IRR) — free, runs in your browser
Outcomes per person-time (person-years/months): one group gives incidence rate with an exact Poisson CI; two groups give the incidence rate ratio IRR (W… Computed in your browser — no data uploaded.
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Common questions
When should I use Incidence Rate & Rate Ratio?
Outcomes per person-time (person-years/months): one group gives incidence rate with an exact Poisson CI; two groups give the incidence rate ratio IRR (Wald log CI + exact conditional CI). Suits cohorts, adverse-event rates, recurrence rates.
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All calculations run entirely in your browser. No data is sent to any server. You can even use the tool offline after the page loads.
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Outcomes per person-time (person-years/months): one group gives incidence rate with an exact Poisson CI; two groups give the incidence rate ratio IRR (W… Computed in your browser — no data uploaded.
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